1、Designation: C562 15 An American National StandardStandard Test Method forMoisture in a Graphite Sample1This standard is issued under the fixed designation C562; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revi
2、sion. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 This test method provides a practical de
3、termination forthe percentage of moisture in a graphite sample.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is t
4、heresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C561 Test Method for Ash in a Graphite Sample3. Terminology3.1 Definitions:3.1.1 mois
5、ture content, npercentage content by weight ofvolatile moisture present in the graphite specimen that has beenexposed to ambient conditions.4. Significance and Use4.1 This test method is applicable only for determination ofthe volatile moisture content resulting from adsorption of watervapor from th
6、e atmosphere, and is not intended to giverepresentative moisture data for graphite that has been exposedto liquid water contamination.5. Interferences5.1 Final weights (and therefore percent moisture values)may be influenced by the following:5.1.1 Type and condition of desiccant.5.1.2 Ambient relati
7、ve humidity at the time of the test.5.1.3 Timing and procedure for moving samples from des-iccator to the balance.5.1.4 Adsorptivity of the graphite sample relative to theadsorptivity of the desiccant used.5.1.5 Residency time in the desiccator.6. Apparatus6.1 Alumina Ceramic or Platinum Crucible or
8、 Dish, suit-able for holding sample (subsequently called sample holder).6.2 Analytical Balance, capable of weighing to 60.0002 g.6.3 Drying Oven, air convection type, capable of beingcontrolled to 110 C 6 2 C.6.4 Desiccator, charged with indicating desiccant.7. Sampling7.1 Samples may be solid or pa
9、rticulate. Solid bodies maybe sampled by removing one or more solid pieces from thebody by, for example, sawing, turning, milling, or fracturing.Particulate samples may be generated from solid bodies bydrilling, using a carbide drill to minimize contamination, or byother crushing and grinding method
10、s.8. Procedure8.1 Tare a dried sample holder using an analytical balance.Weigh a 25 g to 50 g sample into the tared sample holder andreweigh both. (Perform all weighings to a precision of60.002 g.)8.2 Place the sample holder containing the sample in adrying oven maintained at 110 C 6 2 C for 2 h. Re
11、movefrom the oven and immediately place in the desiccator. Whenthe sample has reached room temperature, remove from thedesiccator and weigh immediately.8.3 Repeat the procedure prescribed in 8.2 until a constantweight of 60.002 g is achieved.8.4 The dried sample may be reserved for ash determina-tio
12、n. (See Test Method C561.)1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility ofSubcommittee D02.F0 on Manufactured Carbon and Graphite Products.Current edition approved Oct. 1, 2015. Published November
13、 2015. Originallyapproved in 1965. Last previous edition approved in 2010 as C562 91(2010)1.DOI: 10.1520/C0562-15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to th
14、e standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States19. Calculation9.1 Calculate the percentage of moisture content as fo
15、llows:Moisture, % 5 B 2 C!/B 2 A!# 3100where:A = weight of sample holder,B = weight of sample holder and sample, andC = weight of sample holder and dried sample.10. Report10.1 The report shall include the following information:10.1.1 Proper identification of the sample, and10.1.2 Results obtained fr
16、om at least two moisturedeterminations, and their average.11. Precision and Bias311.1 The precision of this test method was determinedduring a round-robin test among four laboratories testingsamples split from a common sample which was ground to passa No. 60 (250 m) sieve. This sampling method was u
17、sed forthe round robin to minimize variations among samples pro-vided to participating laboratories.11.2 On this sample the mean, standard deviation betweenlaboratories and standard deviation within laboratories were,respectively:Mean 0.0155 %Between laboratories 0.0143 %Within laboratories 0.0037 %
18、11.3 No bias was noted during the round-robin test;however, the method is empirical and there is no suitablereference material that can be used to determine the bias of thistest method.12. Keywords12.1 carbon; graphite; moistureSUMMARY OF CHANGESSubcommittee D02.F0 has identified the location of sel
19、ected changes to this standard since the last issue(C562 91 (2010)1) that may impact the use of this standard. (Approved Oct. 1, 2015.)(1) Added new Section 3, Terminology. (2) Revised subsections 4.1 and 9.1.ASTM International takes no position respecting the validity of any patent rights asserted
20、in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the
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22、reful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM Internatio
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24、 ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:C05-1008.C562 152
